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A Simple Gravimetric Method to Determine Barometer Corrections.

Randall M Schoonover¹

¹National Bureau of Standards, Washington, D.C. 20234.

Journal of Research of the National Bureau of Standards (1977)

|September 27, 2021

Summary

This summary is machine-generated.

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A new gravimetric method calibrates barometers by measuring force differences on a balance with calibrated artifacts. This technique accurately calculates ambient pressure with high precision, offering a reliable calibration alternative.

Area of Science:

Metrology
Physical Chemistry

Background:

Accurate barometer calibration is crucial for various scientific and industrial applications.
Existing calibration methods can be complex and require specialized equipment.

Purpose of the Study:

To present a novel gravimetric method for calibrating barometers.
To determine the precision and reliability of this new calibration technique.

Main Methods:

Utilizing a gravimetric approach with two artifacts of similar mass but different volumes.
Measuring air temperature and relative humidity during weighing to calculate air density.
Deriving a barometer correction based on observed force differences and calculated air density.

Main Results:

Keywords:

Air density air density equation barometer calibration barometric pressure displacement volume gravimetric method mass artifacts weighing

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The gravimetric method allows for the calculation of ambient pressure.

Pressure was determined with an uncertainty of 400 ppm (1 S.D.) at one atmosphere.

The derived barometer correction showed good agreement with a standard barometer.

Conclusions:

The presented gravimetric method offers a precise and potentially simpler alternative for barometer calibration.
This technique provides accurate pressure measurements suitable for metrological applications.